The student council at California Online Public School organized a fundraiser for charity. They found that 65% of the students participated in the fundraiser by selling cookies. If there are 80 students in California Online Public School, how many students participated by selling cookies?

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We can find the number of students who participated by selling cookies by multiplying the total number of students by the percentage who participated.

Number of students who participated = 80 students x 65%
Number of students who participated = 80 x 0.65
Number of students who participated = 52 students

Therefore, 52 students participated in the fundraiser by selling cookies.